|Publication number||US7147632 B2|
|Application number||US 10/961,994|
|Publication date||Dec 12, 2006|
|Filing date||Oct 7, 2004|
|Priority date||Nov 2, 2001|
|Also published as||US6878147, US7318824, US7527623, US7594313, US8035570, US8643561, US9041616, US20030088242, US20050062666, US20050085881, US20060264923, US20060293650, US20100082082, US20120029501, US20140155881, US20150250541, US20160135887|
|Publication number||10961994, 961994, US 7147632 B2, US 7147632B2, US-B2-7147632, US7147632 B2, US7147632B2|
|Inventors||Mani Prakash, Francesca Rossetto, Anthony Lee, Steven Kim, Ted Su, Jonathan Glassman|
|Original Assignee||Vivant Medical Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (103), Non-Patent Citations (3), Referenced by (78), Classifications (18), Legal Events (7)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation of U.S. application Ser. No. 10/052,848, filed Nov. 2, 2001, now U.S. Pat. No. 6,878,147 the contents of which is hereby incorporated by reference into the present disclosure.
The invention relates generally to microwave antenna probes which may be used in tissue ablation applications. More particularly, the invention relates to microwave antennas which may be inserted directly into tissue for diagnosis and treatment of diseases.
In the treatment of diseases such as cancer, certain types of cancer cells have been found to denature at elevated temperatures which are slightly lower than temperatures normally injurious to healthy cells. These types of treatments, known generally as hyperthermia therapy, typically utilize electromagnetic radiation to heat diseased cells to temperatures above 41° C. while maintaining adjacent healthy cells at lower temperatures where irreversible cell destruction will not occur. Other procedures utilizing electromagnetic radiation to heat tissue also include ablation and coagulation of the tissue. Such microwave ablation procedures, e.g., such as those performed for menorrhagia, are typically done to ablate and coagulate the targeted tissue to denature or kill it. Many procedures and types of devices utilizing electromagnetic radiation therapy are known in the art. Such microwave therapy is typically used in the treatment of tissue and organs such as the prostate, heart, and liver.
One non-invasive procedure generally involves the treatment of tissue (e.g., a tumor) underlying the skin via the use of microwave energy. The microwave energy is able to non-invasively penetrate the skin to reach the underlying tissue. However, this non-invasive procedure may result in the unwanted heating of healthy tissue. Thus, the non-invasive use of microwave energy requires a great deal of control. This is partly why a more direct and precise method of applying microwave radiation has been sought.
Presently, there are several types of microwave probes in use, e.g., monopole, dipole, and helical. One type is a monopole antenna probe, which consists of a single, elongated microwave conductor exposed at the end of the probe. The probe is sometimes surrounded by a dielectric sleeve. The second type of microwave probe commonly used is a dipole antenna, which consists of a coaxial construction having an inner conductor and an outer conductor with a dielectric separating a portion of the inner conductor and a portion of the outer conductor. In the monopole and dipole antenna probe, microwave energy generally radiates perpendicularly from the axis of the conductor.
The typical microwave antenna has a long, thin inner conductor which extends along the axis of the probe and is surrounded by a dielectric material and is further surrounded by an outer conductor around the dielectric material such that the outer conductor also extends along the axis of the probe. In another variation of the probe which provides for effective outward radiation of energy or heating, a portion or portions of the outer conductor can be selectively removed. This type of construction is typically referred to as a “leaky waveguide” or “leaky coaxial” antenna. Another variation on the microwave probe involves having the tip formed in a uniform spiral pattern, such as a helix, to provide the necessary configuration for effective radiation. This variation can be used to direct energy in a particular direction, e.g., perpendicular to the axis, in a forward direction (i.e., towards the distal end of the antenna), or a combination thereof.
Invasive procedures and devices have been developed in which a microwave antenna probe may be either inserted directly into a point of treatment via a normal body orifice or percutaneously inserted. Such invasive procedures and devices potentially provide better temperature control of the tissue being treated. Because of the small difference between the temperature required for denaturing malignant cells and the temperature injurious to healthy cells, a known heating pattern and predictable temperature control is important so that heating is confined to the tissue to be treated. For instance, hyperthermia treatment at the threshold temperature of about 41.5° C. generally has little effect on most malignant growths of cells. However, at slightly elevated temperatures above the approximate range of 43° C. to 45° C., thermal damage to most types of normal cells is routinely observed; accordingly, great care must be taken not to exceed these temperatures in healthy tissue.
However, many types of malignancies are difficult to reach and treat using non-invasive techniques or by using invasive antenna probes designed to be inserted into a normal body orifice, i.e., a body opening which is easily accessible. These types of conventional probes may be more flexible and may also avoid the need to separately sterilize the probe; however, they are structurally weak and typically require the use of an introducer or catheter to gain access to within the body. Moreover, the addition of introducers and catheters necessarily increase the diameter of the incision or access opening into the body thereby making the use of such probes more invasive and further increasing the probability of any complications that may arise.
Structurally stronger invasive probes exist and are typically long, narrow, needle-like antenna probes which may be inserted directly into the body tissue to directly access a site of a tumor or other malignancy. Such rigid probes generally have small diameters which aid not only in ease of use but also reduce the resulting trauma to the patient. A convenience of rigid antenna probes capable of direct insertion into tissue is that the probes may also allow for alternate additional uses given different situations. However, such rigid, needle-like probes commonly experience difficulties in failing to provide uniform patterns of radiated energy, they fail to provide uniform heating axially along and radially around an effective length of the probe; and it is difficult to otherwise control and direct the heating pattern when using such probes.
Accordingly, there remains a need for a microwave antenna probe which overcomes the problems discussed above. There also exists a need for a microwave antenna probe which is structurally robust enough for direct insertion into tissue without the need for additional introducers or catheters and which produces a controllable and predictable heating pattern.
A microwave antenna assembly which is structurally robust enough for unaided direct insertion into tissue is described herein. The microwave antenna assembly is generally comprised of a radiating portion which may be connected to a feedline (or shaft) which in turn may be connected by a cable to a power generating source such as a generator. The microwave assembly may be a monopole microwave antenna assembly but is preferably a dipole assembly. The distal portion of the radiating portion preferably has a tapered end which terminates at a tip to allow for the direct insertion into tissue with minimal resistance. The proximal portion is located proximally of the distal portion, and a junction member is preferably located between both portions.
The adequate rigidity necessary for unaided direct insertion of the antenna assembly into tissue, e.g., percutaneously, preferably comes in part by a variety of different methods. Some of the methods include assembling the antenna under a pre-stressed condition prior to insertion into tissue. This may be accomplished in part by forcing an inner conductor, which runs longitudinally through the assembly, into a tensile condition by preferably affixing the inner conductor distal end to the distal radiating portion of the antenna assembly. Another method includes configuring the proximal and distal radiating portions of the antenna to mechanically fasten to each other. That is, the proximal and distal radiating portions may be configured to “screw” into one another directly or to a junction member located between the two portions and which is threaded such that the portions each screw onto the junction member separately.
Another method includes attaching the proximal and distal radiating portions together by creating overlapping or interfitting joints. In this variation, either the proximal or the distal radiating portion may be configured to create an overlapping joint by interfitting with each other through a variety of joints. For instance, the distal portion may be configured to intimately fit within a receiving cavity or channel at the distal end of the proximal portion. The two portions may also be configured to have a number of pins or conical members extending to join the two. Alternatively, the two portions may be frictionally interfitted by an interference fitted joint; or depressible/retractable projections may be disposed on either portion to interfit with corresponding depressions in the opposite portion.
To further aid in strengthening the antenna assemblies, a variety of methods may also be used for attaching the tip or distal portion. For instance, a variation may have a distal portion which may screw onto a threaded inner conductor or another variation may have an inner conductor having an anchoring element capable of holding the inner conductor within a splittable distal portion. Furthermore, a multi-sectioned distal portion may also be utilized for first attaching an inner conductor to the distal portion and then assembling the distal portion with additional variable sections. In many of the variations described herein, it may be preferable to have a dielectric material applied as a layer or coating between the two radiating portions.
Affixing the inner conductor within the distal radiating portion may be accomplished in a variety of ways, for instance, welding, brazing, soldering, or through the use of adhesives. Forcing the inner conductor into a tensile condition helps to force the outer diameter of the antenna into a compressive state. This bi-directional stress state in turn aids in rigidizing the antenna assembly.
To enable a compressive state to exist near the outer diameter, the junction member between the distal and the proximal radiating portions in some of the variations is preferably made from a sufficiently hard dielectric material, e.g., ceramic materials. The hardness of the junction member aids in transferring the compressive forces through the antenna assembly without buckling or kinking during antenna insertion into tissue. Furthermore, materials such as ceramic generally have mechanical properties where fracturing or cracking in the material is more likely to occur under tensile loading conditions. Accordingly, placing a junction under pre-stressed conditions, particularly a junction made of ceramic, may aid in preventing mechanical failure of the junction if the antenna were to incur bending moments during insertion into tissue which could subject portions of the junction under tensile loads. The junction member may also be made into uniform or non-uniform, e.g., stepped, shapes to accommodate varying antenna assembly designs.
Moreover, to improve the energy focus of an antenna assembly, an electrical choke may also be used in any of the variations described herein to contain returning currents to the distal end of the antenna assembly. Generally, the choke may be disposed on top of a dielectric material on the antenna proximally of the radiating section. The choke is preferably comprised of a conductive layer and may be further covered by a tubing or coating to force the conductive layer to conform to the underlying antenna.
Additionally, variations on the choke, the tubing or coating, any sealant layers, as well as other layers which may be disposed over the antenna assembly may be used. Certain layers, e.g., a heatshrink layer disposed over the antenna assembly, may have wires or strands integrated within the layer to further strengthen the antenna assembly. Kevlar wires, for instances, may be integrally formed into the layer and oriented longitudinally with the antenna axis to provide additional strength.
In invasively treating diseased areas of tissue in a patient, trauma may be caused to the patient resulting in pain and other complications. Various microwave antenna assemblies, as described herein, are less traumatic than devices currently available and as described in further detail below, methods of manufacturing such devices are also described. Generally, an apparatus of the present invention allows for the direct insertion of a microwave antenna into tissue for the purposes of diagnosis and treatment of disease.
In some applications a microwave antenna requires adequate structural strength to prevent bending of the antenna, e.g., where the antenna is directly inserted into tissue, where the antenna undergoes bending moments after insertion, etc. Accordingly, there are various configurations to increase the antenna strength without compromising desirable radiative properties and the manufacturability of such an antenna. One configuration involves placing the antenna assembly under a compressive load to stiffen the radiating portions. Another configuration involves mechanically fastening, e.g., in a screw-like manner, the radiating portions together to provide a joint which will withstand bending moments. A further configuration may also involve creating overlapping joints between the radiating portions of the antenna assembly to provide a high-strength antenna. Furthermore, alternate configurations of attaching a distal tip or distal radiating portion to an antenna may be utilized to further increase the antenna strength.
Antenna Assembly Via Compression
Generally, the antenna assembly 10 in
Feedline 14 may electrically connect antenna assembly 10 via cable 15 to generator 28 and usually comprises a coaxial cable made of a conductive metal which may be semi-rigid or flexible. Feedline 14 may also have a variable length from a proximal end of radiating portion 12 to a distal end of cable 15 ranging between about 1 to 10 inches. Most feedlines may be constructed of copper, gold, or other conductive metals with similar conductivity values, but feedline 14 is preferably made of stainless steel. The metals may also be plated with other materials, e.g., other conductive materials, to improve their properties, e.g., to improve conductivity or decrease energy loss, etc. A feedline 14, such as one made of stainless steel, preferably has an impedance of about 50 Ω and to improve its conductivity, the stainless steel may be coated with a layer of a conductive material such as copper or gold. Although stainless steel may not offer the same conductivity as other metals, it does offer strength required to puncture tissue and/or skin.
In operation, microwave energy having a wavelength, λ, is transmitted through antenna assembly 30 along both proximal and distal radiating portions 36, 38. This energy is then radiated into the surrounding medium, e.g., tissue. The length of the antenna for efficient radiation may be dependent at least on the effective wavelength, λeff, which is dependent upon the dielectric properties of the medium being radiated into. Energy from the antenna assembly 30 radiates and the surrounding medium is subsequently heated. An antenna assembly 30 through which microwave energy is transmitted at a wavelength, λ, may have differing effective wavelengths, λeff, depending upon the surrounding medium, e.g., liver tissue, as opposed to, e.g., breast tissue. Also affecting the effective wavelength, λeff, are coatings which may be disposed over antenna assembly 30, as discussed further below.
The compression load is preferably first created by feeding distal portion 48 over inner conductor 44 until junction member 62 is under compression, then inner conductor 44 is preferably affixed to distal portion 48 to maintain the compression load on junction member 62. Some clearance may be necessary between junction member 62 and inner conductor 44 to avoid any interference resistance between the two. Inner conductor 44 may be affixed to distal portion 48 along interface 72 by a variety of methods, such as welding, brazing, soldering, or by use of adhesives. The compression loading occurs such that while inner conductor 44 is placed under tension along direction 76, distal portion 48 places the outer portions of junction member 62 under compression along directions 74. Inner conductor 44 may be heated prior to affixing it to distal portion 48 by any number of methods because heating inner conductor 44 may expand the conductor in a longitudinal direction (depending upon the coefficient of thermal expansion of the inner conductor 44).
For example, heating inner conductor 44 may be accomplished during the welding or soldering procedure. Upon cooling, inner conductor 44 may contract accordingly and impart a tensile force upon the conductor 44 while simultaneously pulling junction member 62 into compression. To allow the compression loading to transfer efficiently through assembly 70, junction member 62 is preferably made of a dielectric material which has a sufficiently high compressive strength and high elastic modulus, i.e., resistant to elastic or plastic deformation under a compression load. Therefore, junction member 62 is preferably made from materials such as ceramics, e.g., Al2O3, Boron Nitride, stabilized Zirconia, etc. Alternatively, a junction member 62 made of a metal and sufficiently coated with a dielectric or polymer may be used, provided the dielectric coating is sufficiently thick to provide adequate insulation. To prevent energy from conducting directly into the tissue during use, a dielectric layer having a thickness between about 0.0001 to 0.003 inches, may be coated directly over antenna assembly 70. The dielectric coating may increase the radiated energy and is preferably made from a ceramic material, such as Al2O3, TiO2, etc., and may also be optionally further coated with a lubricious material such as Teflon, polytetrafluoroethylene (PTFE), or fluorinated ethylene propylene (FEP), etc. In addition to the dielectric coating, a sealant layer may also be coated either directly over the antenna assembly 70, or preferably over the dielectric layer to provide a lubricious surface for facilitating insertion into a patient as well as to prevent tissue from sticking to the antenna assembly 70. The sealant layer may be any variety of polymer, but is preferably a thermoplastic polymer and may have a thickness varying from a few angstroms to as thick as necessary for the application at hand. Varying these coating thicknesses over antenna assembly 70 may vary the effective wavelengths, λeff, of the radiation being transmitted by the antenna. Thus, one may vary the coating thicknesses over the assembly 70 to achieve a predetermined effective wavelength depending upon the desired results.
The location of tip 98 may be proportional to a distance of λ/4 of the radiation being transmitted through assembly 80, but because tip 98 terminates at tapered end 96, the angled surface of taper 96 may be taken into account. Thus, the total distance along the outer surfaces of assembly 80 from B to C plus the distance from C to D may accord to the distance of λ/4. The length of proximal radiating portion 82, i.e., the distance along the outer surface of assembly 80 from A to B, may also accord to the distance of λ/4, as above. Although it is preferable to have the length of the radiating portion of the antenna accord with a distance of the wavelength, λ, it is not necessary for operation of the device, as described above. That is, an antenna assembly having a radiating portion with a length in accordance with a first wavelength may generally still be used for transmitting radiation having a second wavelength, or third wavelength, or so on, although with a possible reduction in efficiency.
In addition to stepped junction member 102,
However, having channel 122 extend from the distal tip 124 to inner conductor 112 may limit the sharpness of tip 124. Accordingly, variation 130 in
While most of the variations described above are related to dipole antenna assemblies,
To improve the energy focus of an antenna assembly, an electrical choke may also be used to contain returning currents to the distal end of the antenna. Generally, the choke may be disposed on the antenna proximally of the radiating section. The choke is preferably placed over a dielectric material which may be disposed over the antenna The choke is preferably a conductive layer and may be further covered by a tubing or coating to force the conductive layer to conform to the underlying antenna, thereby forcing an electrical connection (or short) more distally and closer to the radiating section. The electrical connection between the choke and the underlying antenna may also be achieved by other connection methods such as soldering, welding, brazing, crimping, use of conductive adhesives, etc. The following description is directed towards the use of a choke on a compression antenna variation for illustration purposes only; however, the choke may also be used with any of the antenna variations described below.
Variation 160 illustrates electrical contact between conductive layer 224 and outer conductor 196 in detail 178 occurring at the proximal location of electrical choke portion 170, but choke 172 may be formed without forcing contact between outer conductor 196 with layer 224 provided the length of choke 172 is chosen appropriately. For instance, choke 172 having a sufficiently long length, e.g., a length of λ/2, may be used without having to force contact between the layers. Outer dielectric layer 226 may be disposed upon conductive layer 224. Outer dielectric layer 226 may also be made of any of the various polymers as described above and is preferably a heat shrinkable layer that may force conductive layer 224 to conform more closely to the underlying layers to not only force a better electrical connection, but also to reduce the overall diameter of the antenna section.
Further steps may optionally be taken to further increase the strength of an antenna assembly by altering any of the layers, such as sealant layer 210 or any of the other heatshrink layers discussed above.
Antenna Assembly Via Mechanical Fastening
Aside from using a compressive load to increase antenna strength, as described above, alternative methods may be employed for increasing antenna strength to withstand direct insertion into tissue. An alternative variation may include assembling an antenna using mechanical fastening methods.
Junction member 246 is preferably comprised of any of the dielectric materials as described above. Alternatively, a dielectric coating or layer may also be applied to the inside of channels 248, 260 which contacts junction member 246. First and second mating sections 252, 254 may be threaded 256, 258, respectively, such that the thread pitch on each section 252, 254 is opposed to each other, i.e., the pitch angle of threading 256 may be opposite to the pitch angle of threading 258. Alternatively, the thread pitch on each section 252, 254 may be configured to be angled similarly for ease of antenna assembly. Proximal portion 242 may have a receiving cavity or channel 248 which is threaded 250 at a predetermined pitch to correspond to the pitch and angle of the threading 256 on first mating section 252. Likewise, distal portion 244 may have a receiving cavity or channel 260 which is threaded 262 at a predetermined pitch to correspond to the pitch and angle of the threading 258 on second mating section 254. Having opposed pitch angles may be done to ensure a secure fit or joint when variation 240 is assembled by screwing proximal portion 242 and distal portion 244 together onto junction member 246.
A further screw-on variation 270 is shown in
Antenna Assembly Via Overlap
Another variation on assembling an antenna is by use of overlapping or interfitting joints to attach proximal and distal portions together.
Another variation is shown in distal portion 352 where rather than having a conical interfitting member, separate pins or dowels 360 may be used to extend into receiving channels 356′ of proximal portion 354′. These pins 360 may be integral with distal portion 352 or they may be separate members inserted and held in distal portion 352; in either case, pins 360 are preferably made of a hard dielectric material or a metal sufficiently coated with a dielectric material for insulation. As seen in
Alternate Methods of Tin or Distal Portion Attachment
Aside from various methods of assembling microwave antennas, there are also a variety of methods for attaching the tip or distal radiating portion to a remainder of the assembly. The various methods described below may be used in any of the assembly variations discussed herein depending upon the desired antenna assembly characteristics.
Another variation for attaching the distal portion is shown in
To further aid in tip or distal portion attachment to the antenna assembly, various distal portions may be used to facilitate assembly and use in a patient. As previously described, the distal tip is preferably tapered and terminates at a tip to facilitate antenna insertion into tissue with minimal resistance. Also, attaching the inner conductor to the distal portion may be facilitated by an access channel defined in the distal portion so that the inner conductor may be attached by welding, soldering, etc. within the distal portion. To further facilitate this assembly process, the distal tip may be formed into an arcuate or curved face terminating into a tip, as seen in
Alternate Distal Portion Attachments
As discussed above, the energy with a wavelength, λ, is transmitted down a microwave antenna and is subsequently radiated into the surrounding medium. In operation, microwave energy having a wavelength, λ, is transmitted through the antenna assembly along both proximal and distal radiating portions. This energy is then radiated into the surrounding medium. The length of the antenna for efficient radiation may be dependent at least on the effective wavelength, λeff, which is dependent upon the dielectric properties of the medium being radiated into. Energy having the effective wavelength radiates and the surrounding medium is subsequently heated. An antenna assembly through which microwave energy is transmitted at a wavelength, λ, may have differing effective wavelengths, λeff, depending upon whether the energy is radiated into, e.g., liver tissue, as opposed to, e.g., breast tissue. Also affecting the effective wavelength, λeff, are coatings which may be disposed over the antenna assembly.
Accordingly, various distal portions having varying diameters are shown in
The applications of the antenna assemblies and methods of making the assemblies discussed above are not limited to microwave antennas used for hyperthermic, ablation, and coagulation treatments but may include any number of further microwave antenna applications. Modification of the above-described assemblies and methods for carrying out the invention, and variations of aspects of the invention that are obvious to those of skill in the art are intended to be within the scope of the claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US4140130||May 31, 1977||Feb 20, 1979||Storm Iii Frederick K||Electrode structure for radio frequency localized heating of tumor bearing tissue|
|US4311154||Mar 23, 1979||Jan 19, 1982||Rca Corporation||Nonsymmetrical bulb applicator for hyperthermic treatment of the body|
|US4557272||Feb 9, 1981||Dec 10, 1985||Microwave Associates, Inc.||Microwave endoscope detection and treatment system|
|US4612940||May 9, 1984||Sep 23, 1986||Scd Incorporated||Microwave dipole probe for in vivo localized hyperthermia|
|US4621642||Mar 14, 1985||Nov 11, 1986||North China Research Institute Of Electro-Optics||Microwave apparatus for physiotherapeutic treatment of human and animal bodies|
|US4658836||Jun 28, 1985||Apr 21, 1987||Bsd Medical Corporation||Body passage insertable applicator apparatus for electromagnetic|
|US4700716||Feb 27, 1986||Oct 20, 1987||Kasevich Associates, Inc.||Collinear antenna array applicator|
|US4776086||Sep 24, 1987||Oct 11, 1988||Kasevich Associates, Inc.||Method and apparatus for hyperthermia treatment|
|US4800899||Oct 29, 1986||Jan 31, 1989||Microthermia Technology, Inc.||Apparatus for destroying cells in tumors and the like|
|US5190054||Jul 26, 1991||Mar 2, 1993||Labthermics Technologies, Inc.||Microwave hyperthermia probe|
|US5221269||Oct 15, 1990||Jun 22, 1993||Cook Incorporated||Guide for localizing a nonpalpable breast lesion|
|US5246438||Jan 9, 1992||Sep 21, 1993||Sensor Electronics, Inc.||Method of radiofrequency ablation|
|US5249585||Nov 5, 1990||Oct 5, 1993||Bsd Medical Corporation||Urethral inserted applicator for prostate hyperthermia|
|US5275597 *||May 18, 1992||Jan 4, 1994||Baxter International Inc.||Percutaneous transluminal catheter and transmitter therefor|
|US5281217||Apr 13, 1992||Jan 25, 1994||Ep Technologies, Inc.||Steerable antenna systems for cardiac ablation that minimize tissue damage and blood coagulation due to conductive heating patterns|
|US5301687 *||Jun 6, 1991||Apr 12, 1994||Trustees Of Dartmouth College||Microwave applicator for transurethral hyperthermia|
|US5314466||Apr 13, 1992||May 24, 1994||Ep Technologies, Inc.||Articulated unidirectional microwave antenna systems for cardiac ablation|
|US5344441||Sep 27, 1993||Sep 6, 1994||Volker Gronauer||Antenna arrangement with supply cable for medical applications|
|US5370644||Jul 16, 1993||Dec 6, 1994||Sensor Electronics, Inc.||Radiofrequency ablation catheter|
|US5405346||Dec 3, 1993||Apr 11, 1995||Fidus Medical Technology Corporation||Tunable microwave ablation catheter|
|US5500012||Jul 8, 1994||Mar 19, 1996||Angeion Corporation||Ablation catheter system|
|US5507743||Aug 16, 1994||Apr 16, 1996||Zomed International||Coiled RF electrode treatment apparatus|
|US5520684||Aug 3, 1994||May 28, 1996||Imran; Mir A.||Transurethral radio frequency apparatus for ablation of the prostate gland and method|
|US5556377||Dec 22, 1993||Sep 17, 1996||Vidamed, Inc.||Medical probe apparatus with laser and/or microwave monolithic integrated circuit probe|
|US5599294||Oct 7, 1994||Feb 4, 1997||Vidamed, Inc.||Microwave probe device and method|
|US5720718||Jan 6, 1994||Feb 24, 1998||Vidamed, Inc.||Medical probe apparatus with enhanced RF, resistance heating, and microwave ablation capabilities|
|US5776176||Jun 17, 1996||Jul 7, 1998||Urologix Inc.||Microwave antenna for arterial for arterial microwave applicator|
|US5800486||Jun 17, 1996||Sep 1, 1998||Urologix, Inc.||Device for transurethral thermal therapy with cooling balloon|
|US5810804||Mar 15, 1996||Sep 22, 1998||Rita Medical Systems||Multiple antenna ablation apparatus and method with cooling element|
|US5829519||Mar 10, 1997||Nov 3, 1998||Enhanced Energy, Inc.||Subterranean antenna cooling system|
|US5871523||Aug 12, 1996||Feb 16, 1999||Ep Technologies, Inc.||Helically wound radio-frequency emitting electrodes for creating lesions in body tissue|
|US5897554||Mar 1, 1997||Apr 27, 1999||Irvine Biomedical, Inc.||Steerable catheter having a loop electrode|
|US5904691||Sep 26, 1997||May 18, 1999||Picker International, Inc.||Trackable guide block|
|US5904709||Apr 17, 1996||May 18, 1999||The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration||Microwave treatment for cardiac arrhythmias|
|US5938692||Mar 26, 1996||Aug 17, 1999||Urologix, Inc.||Voltage controlled variable tuning antenna|
|US5951547||Nov 3, 1997||Sep 14, 1999||Rita Medical Systems, Inc.||Multiple antenna ablation apparatus and method|
|US5957969||Jul 22, 1997||Sep 28, 1999||Fidus Medical Technology Corporation||Tunable microwave ablation catheter system and method|
|US5964755||Oct 11, 1996||Oct 12, 1999||Vioacare International, Inc.||Thin layer ablation apparatus|
|US5974343||Jan 13, 1997||Oct 26, 1999||Bruker Sa||Probe, particulary a urethral probe, for heating of tissues by microwave and for the measurement of temperature by radiometry|
|US5980563||Aug 31, 1998||Nov 9, 1999||Tu; Lily Chen||Ablation apparatus and methods for treating atherosclerosis|
|US6016811||Sep 1, 1998||Jan 25, 2000||Fidus Medical Technology Corporation||Method of using a microwave ablation catheter with a loop configuration|
|US6026331||Jul 19, 1994||Feb 15, 2000||Microsulis Limited||Treatment apparatus|
|US6032078||Oct 22, 1997||Feb 29, 2000||Urologix, Inc.||Voltage controlled variable tuning antenna|
|US6056744||Feb 19, 1998||May 2, 2000||Conway Stuart Medical, Inc.||Sphincter treatment apparatus|
|US6059780||Nov 4, 1997||May 9, 2000||Rita Medical Systems, Inc.||Multiple antenna ablation apparatus and method with cooling element|
|US6073051||Jun 24, 1997||Jun 6, 2000||Oratec Interventions, Inc.||Apparatus for treating intervertebal discs with electromagnetic energy|
|US6080150||Feb 24, 1998||Jun 27, 2000||Rita Medical Systems, Inc.||Cell necrosis apparatus|
|US6097985||Feb 9, 1999||Aug 1, 2000||Kai Technologies, Inc.||Microwave systems for medical hyperthermia, thermotherapy and diagnosis|
|US6106518||Apr 9, 1998||Aug 22, 2000||Cryocath Technologies, Inc.||Variable geometry tip for a cryosurgical ablation device|
|US6122551||Dec 11, 1998||Sep 19, 2000||Urologix, Inc.||Method of controlling thermal therapy|
|US6134476||Sep 17, 1998||Oct 17, 2000||The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration||Transcatheter antenna for microwave treatment|
|US6146379||Dec 10, 1996||Nov 14, 2000||Ep Technologies, Inc.||Systems and methods for creating curvilinear lesions in body tissue|
|US6176856||Dec 18, 1998||Jan 23, 2001||Eclipse Surgical Technologies, Inc||Resistive heating system and apparatus for improving blood flow in the heart|
|US6181970||Feb 9, 1999||Jan 30, 2001||Kai Technologies, Inc.||Microwave devices for medical hyperthermia, thermotherapy and diagnosis|
|US6217528||Feb 11, 1999||Apr 17, 2001||Scimed Life Systems, Inc.||Loop structure having improved tissue contact capability|
|US6223086||Feb 9, 2000||Apr 24, 2001||The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration||Endothelium preserving microwave treatment for atherosclerosis|
|US6233490||Feb 9, 1999||May 15, 2001||Kai Technologies, Inc.||Microwave antennas for medical hyperthermia, thermotherapy and diagnosis|
|US6245064||Jan 11, 2000||Jun 12, 2001||Atrionix, Inc.||Circumferential ablation device assembly|
|US6251128||Sep 1, 1998||Jun 26, 2001||Fidus Medical Technology Corporation||Microwave ablation catheter with loop configuration|
|US6275738||Aug 19, 1999||Aug 14, 2001||Kai Technologies, Inc.||Microwave devices for medical hyperthermia, thermotherapy and diagnosis|
|US6277113||May 28, 1999||Aug 21, 2001||Afx, Inc.||Monopole tip for ablation catheter and methods for using same|
|US6290715||Jan 25, 1999||Sep 18, 2001||Oratec Interventions, Inc.||Method for delivering energy adjacent the inner wall of an intervertebral disc|
|US6306132||Jun 17, 1999||Oct 23, 2001||Vivant Medical||Modular biopsy and microwave ablation needle delivery apparatus adapted to in situ assembly and method of use|
|US6325796||May 4, 1999||Dec 4, 2001||Afx, Inc.||Microwave ablation instrument with insertion probe|
|US6330479||Dec 6, 1999||Dec 11, 2001||The Regents Of The University Of California||Microwave garment for heating and/or monitoring tissue|
|US6346104||Apr 30, 1997||Feb 12, 2002||Western Sydney Area Health Service||System for simultaneous unipolar multi-electrode ablation|
|US6347251||Dec 23, 1999||Feb 12, 2002||Tianquan Deng||Apparatus and method for microwave hyperthermia and acupuncture|
|US6355033||Jul 16, 1999||Mar 12, 2002||Vivant Medical||Track ablation device and methods of use|
|US6405733||Jul 11, 2000||Jun 18, 2002||Thomas J. Fogarty||Device for accurately marking tissue|
|US6471696 *||Apr 12, 2000||Oct 29, 2002||Afx, Inc.||Microwave ablation instrument with a directional radiation pattern|
|US6496738||Feb 6, 2001||Dec 17, 2002||Kenneth L. Carr||Dual frequency microwave heating apparatus|
|US6514251||Aug 13, 1999||Feb 4, 2003||K.U. Leuven Research & Development||Cooled-wet electrode|
|US6530922||Jan 27, 2000||Mar 11, 2003||Sherwood Services Ag||Cluster ablation electrode system|
|US6564806||Feb 18, 2000||May 20, 2003||Thomas J. Fogarty||Device for accurately marking tissue|
|US6569159||Feb 24, 2000||May 27, 2003||Rita Medical Systems, Inc.||Cell necrosis apparatus|
|US6663624||Jul 30, 1999||Dec 16, 2003||Rita Medical Systems, Inc.||RF treatment apparatus|
|US6685700||Nov 13, 2001||Feb 3, 2004||Radiotherapeutics Corporation||Method and system for heating solid tissue|
|US6699241||Aug 8, 2001||Mar 2, 2004||Northeastern University||Wide-aperture catheter-based microwave cardiac ablation antenna|
|US6722371||Oct 27, 2000||Apr 20, 2004||Thomas J. Fogarty||Device for accurately marking tissue|
|US6752154||Aug 22, 2001||Jun 22, 2004||Thomas J. Fogarty||Device for accurately marking tissue|
|US6752767||Oct 15, 2002||Jun 22, 2004||Vivant Medical, Inc.||Localization element with energized tip|
|US6878147 *||Nov 2, 2001||Apr 12, 2005||Vivant Medical, Inc.||High-strength microwave antenna assemblies|
|US20010001819||Jan 10, 2001||May 24, 2001||Lee Kee S.||Cell necrosis apparatus and method|
|US20010037812||Feb 22, 2001||Nov 8, 2001||Dobak John D.||Cryosurgical probe with sheath|
|US20020022832||Oct 16, 2001||Feb 21, 2002||Mikus Paul W.||Cryoprobe assembly with detachable sheath|
|US20020087151||Dec 29, 2000||Jul 4, 2002||Afx, Inc.||Tissue ablation apparatus with a sliding ablation instrument and method|
|US20020133148||Jan 11, 2002||Sep 19, 2002||Daniel Steven A.||Bone-treatment instrument and method|
|US20020147444||Apr 9, 2001||Oct 10, 2002||Krishan Shah||Intradiscal lesioning apparatus|
|US20020198520||Jun 20, 2001||Dec 26, 2002||Scimed Life Systems, Inc.||Irrigation sheath|
|US20030004506||Jun 28, 2001||Jan 2, 2003||Scimed Life Systems, Inc.||Catheter with an irrigated composite tip electrode|
|US20030065317||Sep 19, 2002||Apr 3, 2003||Rudie Eric N.||Microwave ablation device|
|US20030069578||Nov 1, 2002||Apr 10, 2003||Hall Jeffrey A.||Ablation catheter, system, and method of use thereof|
|US20030109862||Oct 15, 2002||Jun 12, 2003||Mani Prakash||High-strength microwave antenna assemblies and methods of use|
|US20030195499||Oct 15, 2002||Oct 16, 2003||Mani Prakash||Microwave antenna having a curved configuration|
|US20040168692||Mar 10, 2004||Sep 2, 2004||Thomas Fogarty||Device for accurately marking tissue|
|US20040267156||Apr 27, 2004||Dec 30, 2004||Vivant Medical, Inc.||Localization element with energized tip|
|US20050015081||Jul 18, 2003||Jan 20, 2005||Roman Turovskiy||Devices and methods for cooling microwave antennas|
|US20050085881||Oct 7, 2004||Apr 21, 2005||Vivant Medical, Inc.||High-strength microwave antenna assemblies|
|EP0667126A1||Jul 12, 1994||Aug 16, 1995||Vidamed, Inc.||Steerable medical probe with stylets|
|WO1993020767A1||Apr 12, 1993||Oct 28, 1993||Ep Technologies, Inc.||Articulated unidirectional microwave antenna systems for cardiac ablation|
|WO1993020768A1||Apr 12, 1993||Oct 28, 1993||Ep Technologies, Inc.||Steerable microwave antenna systems for cardiac ablation|
|WO1996034571A1||May 2, 1996||Nov 7, 1996||Cosman Eric R||Cool-tip electrode thermosurgery system|
|WO1997048449A1||Jun 10, 1997||Dec 24, 1997||Urologix, Inc.||Microwave antenna for arterial microwave applicator|
|1||Chou, C.K. (1995). "Radiofrequency Hyperthermia in Cancer Therapy," Biologic Effects of Nonionizing Electromagnetic Fields. Chapter 94, CRC Press, Inc. pp. 1424-1428.|
|2||International Search Report mailed on Apr. 23, 2003, for PCT patent application No. PCT/US02/34827 filed Oct. 29, 2002, 4 pages.|
|3||Urologix, Inc.-Medical Professionals: Targis3 Technology http://www.urologix.com/medical/technology.html (total pp. 3).|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US7527623||Jul 26, 2006||May 5, 2009||Vivant Medical, Inc.||High-strength microwave antenna assemblies|
|US7594313||Jul 26, 2006||Sep 29, 2009||Vivant Medical, Inc.||Method of manufacturing a microwave antenna assembly|
|US7642451||Jan 9, 2009||Jan 5, 2010||Vivant Medical, Inc.||Thermally tuned coaxial cable for microwave antennas|
|US7799019||May 10, 2005||Sep 21, 2010||Vivant Medical, Inc.||Reinforced high strength microwave antenna|
|US7862559||Aug 22, 2006||Jan 4, 2011||Vivant Medical, Inc.||High-strength microwave antenna assemblies and methods of use|
|US7998139||Apr 25, 2007||Aug 16, 2011||Vivant Medical, Inc.||Cooled helical antenna for microwave ablation|
|US8012148||Aug 20, 2010||Sep 6, 2011||Vivant Medical, Inc.||Reinforced high strength microwave antenna|
|US8035570||Apr 7, 2009||Oct 11, 2011||Vivant Medical, Inc.||High-strength microwave antenna assemblies|
|US8059059||May 29, 2008||Nov 15, 2011||Vivant Medical, Inc.||Slidable choke microwave antenna|
|US8069553 *||Sep 9, 2009||Dec 6, 2011||Vivant Medical, Inc.||Method for constructing a dipole antenna|
|US8118808||Mar 10, 2009||Feb 21, 2012||Vivant Medical, Inc.||Cooled dielectrically buffered microwave dipole antenna|
|US8147489||Feb 17, 2011||Apr 3, 2012||Covidien Ag||Open vessel sealing instrument|
|US8192423||Aug 22, 2011||Jun 5, 2012||Vivant Medical, Inc.||Reinforced high strength microwave antenna|
|US8197633||Mar 15, 2011||Jun 12, 2012||Covidien Ag||Method for manufacturing an end effector assembly|
|US8246614||Mar 6, 2009||Aug 21, 2012||Vivant Medical, Inc.||High-strength microwave antenna coupling|
|US8258399||Jan 4, 2010||Sep 4, 2012||Vivant Medical, Inc.||Thermally tuned coaxial cable for microwave antennas|
|US8262703||Jan 14, 2009||Sep 11, 2012||Vivant Medical, Inc.||Medical device including member that deploys in a spiral-like configuration and method|
|US8292881||May 27, 2009||Oct 23, 2012||Vivant Medical, Inc.||Narrow gauge high strength choked wet tip microwave ablation antenna|
|US8343145||Sep 28, 2009||Jan 1, 2013||Vivant Medical, Inc.||Microwave surface ablation using conical probe|
|US8353901||May 22, 2007||Jan 15, 2013||Vivant Medical, Inc.||Energy delivery conduits for use with electrosurgical devices|
|US8353903||May 6, 2009||Jan 15, 2013||Vivant Medical, Inc.||Power-stage antenna integrated system|
|US8361062||Oct 7, 2011||Jan 29, 2013||Vivant Medical, Inc.||Slidable choke microwave antenna|
|US8409187||Sep 8, 2009||Apr 2, 2013||Covidien Lp||Microwave antenna probe with high-strength ceramic coupler|
|US8414570||Nov 17, 2009||Apr 9, 2013||Bsd Medical Corporation||Microwave coagulation applicator and system|
|US8454602||May 4, 2012||Jun 4, 2013||Covidien Lp||Apparatus, system, and method for performing an electrosurgical procedure|
|US8523898||Aug 10, 2012||Sep 3, 2013||Covidien Lp||Endoscopic electrosurgical jaws with offset knife|
|US8551083||Jan 18, 2010||Oct 8, 2013||Bsd Medical Corporation||Microwave coagulation applicator and system|
|US8551091||Mar 30, 2011||Oct 8, 2013||Covidien Ag||Vessel sealing instrument with electrical cutting mechanism|
|US8568444||Mar 7, 2012||Oct 29, 2013||Covidien Lp||Method of transferring rotational motion in an articulating surgical instrument|
|US8591506||Oct 16, 2012||Nov 26, 2013||Covidien Ag||Vessel sealing system|
|US8597296||Aug 31, 2012||Dec 3, 2013||Covidien Ag||Bipolar forceps having monopolar extension|
|US8624791||Jun 5, 2013||Jan 7, 2014||Venti Group, LLC||Chokes for electrical cables|
|US8643561||Oct 6, 2011||Feb 4, 2014||Covidien Lp||High-strength microwave antenna assemblies|
|US8651146||Sep 29, 2008||Feb 18, 2014||Covidien Lp||Cable stand-off|
|US8663213||May 24, 2012||Mar 4, 2014||Covidien Lp||Reinforced high strength microwave antenna|
|US8672932||Mar 26, 2007||Mar 18, 2014||Neuwave Medical, Inc.||Center fed dipole for use with tissue ablation systems, devices and methods|
|US8745854||Nov 7, 2011||Jun 10, 2014||Covidien Lp||Method for constructing a dipole antenna|
|US8803755||Jun 5, 2013||Aug 12, 2014||Venti Group, LLC||Low passive intermodulation chokes for electrical cables|
|US8832927||Jan 17, 2012||Sep 16, 2014||Covidien Lp||Method of manufacturing surgical antennas|
|US8852228||Feb 8, 2012||Oct 7, 2014||Covidien Lp||Apparatus, system, and method for performing an electrosurgical procedure|
|US8858554||Jun 4, 2013||Oct 14, 2014||Covidien Lp||Apparatus, system, and method for performing an electrosurgical procedure|
|US8898888||Jan 26, 2012||Dec 2, 2014||Covidien Lp||System for manufacturing electrosurgical seal plates|
|US8969722||Aug 29, 2012||Mar 3, 2015||Covidien Lp||Thermally tuned coaxial cable for microwave antennas|
|US8974452||Jan 13, 2014||Mar 10, 2015||Covidien Lp||Reinforced high strength microwave antenna|
|US9023024||Jun 20, 2007||May 5, 2015||Covidien Lp||Reflective power monitoring for microwave applications|
|US9028493||Mar 8, 2012||May 12, 2015||Covidien Lp||In vivo attachable and detachable end effector assembly and laparoscopic surgical instrument and methods therefor|
|US9041616||Feb 4, 2014||May 26, 2015||Covidien Lp||High-strength microwave antenna assemblies|
|US9113898||Sep 9, 2011||Aug 25, 2015||Covidien Lp||Apparatus, system, and method for performing an electrosurgical procedure|
|US9113924||Oct 17, 2008||Aug 25, 2015||Covidien Lp||Choked dielectric loaded tip dipole microwave antenna|
|US9113940||Feb 22, 2012||Aug 25, 2015||Covidien Lp||Trigger lockout and kickback mechanism for surgical instruments|
|US9119649||Jul 28, 2010||Sep 1, 2015||Neuwave Medical, Inc.||Energy delivery systems and uses thereof|
|US9186216||Mar 6, 2015||Nov 17, 2015||Covidien Lp||Reinforced high strength microwave antenna|
|US9192437||Oct 22, 2012||Nov 24, 2015||Covidien Lp||Narrow gauge high strength choked wet tip microwave ablation antenna|
|US9192438||Dec 21, 2012||Nov 24, 2015||Neuwave Medical, Inc.||Energy delivery systems and uses thereof|
|US9265552||Dec 2, 2014||Feb 23, 2016||Covidien Lp||Method of manufacturing electrosurgical seal plates|
|US9305682||Jan 23, 2015||Apr 5, 2016||Covidien Lp||Thermally tuned coaxial cable for microwave antennas|
|US9345535||Oct 14, 2014||May 24, 2016||Covidien Lp||Apparatus, system and method for performing an electrosurgical procedure|
|US9375270||Nov 5, 2013||Jun 28, 2016||Covidien Ag||Vessel sealing system|
|US9375271||Nov 5, 2013||Jun 28, 2016||Covidien Ag||Vessel sealing system|
|US9379444||Jun 10, 2014||Jun 28, 2016||Covidien Lp||Method for constructing a dipole antenna|
|US9463067||Nov 5, 2013||Oct 11, 2016||Covidien Ag||Vessel sealing system|
|US9468499||Nov 15, 2007||Oct 18, 2016||Covidien Lp||Devices and methods for cooling microwave antennas|
|US9480528||Jan 25, 2016||Nov 1, 2016||Covidien Lp||Devices and methods for cooling microwave antennas|
|US20090183895 *||Jan 9, 2009||Jul 23, 2009||Vivant Medical, Inc.||Thermally Tuned Coaxial Cable for Microwave Antennas|
|US20090198226 *||Jan 14, 2009||Aug 6, 2009||Vivant Medical, Inc.||Medical Device Including Member that Deploys in a Spiral-Like Configuration and Method|
|US20100097284 *||Oct 17, 2008||Apr 22, 2010||Vivant Medical, Inc.||Choked Dielectric Loaded Tip Dipole Microwave Antenna|
|US20100101825 *||Jan 4, 2010||Apr 29, 2010||Vivant Medical, Inc.||Thermally Tuned Coaxial Cable for Microwave Antennas|
|US20100234839 *||Mar 10, 2009||Sep 16, 2010||Vivant Medical, Inc.||Cooled Dielectrically Buffered Microwave Dipole Antenna|
|US20100286681 *||May 6, 2009||Nov 11, 2010||Vivant Medical, Inc.||Power-Stage Antenna Integrated System|
|US20100305559 *||May 27, 2009||Dec 2, 2010||Vivant Medical, Inc.||Narrow Gauge High Strength Choked Wet Tip Microwave Ablation Antenna|
|US20110056069 *||Sep 9, 2009||Mar 10, 2011||Vivant Medical, Inc.||Method for Constructing a Dipole Antenna|
|US20110060325 *||Sep 8, 2009||Mar 10, 2011||Vivant Medical, Inc.||Microwave Antenna Probe with High-Strength Ceramic Coupler|
|US20110077634 *||Sep 28, 2009||Mar 31, 2011||Vivant Medical, Inc.||Microwave Surface Ablation Using Conical Probe|
|US20110118720 *||Nov 17, 2009||May 19, 2011||Bsd Medical Corporation||Microwave coagulation applicator and system|
|US20110118723 *||Jan 18, 2010||May 19, 2011||Bsd Medical Corporation||Microwave coagulation applicator and system|
|US20110118724 *||Jun 4, 2010||May 19, 2011||Bsd Medical Corporation||Microwave coagulation applicator and system with fluid injection|
|US20110125148 *||Feb 3, 2011||May 26, 2011||Turner Paul F||Multiple Frequency Energy Supply and Coagulation System|
|USD680220||Jan 12, 2012||Apr 16, 2013||Coviden IP||Slider handle for laparoscopic device|
|U.S. Classification||606/33, 606/41, 343/790|
|Cooperative Classification||A61B2018/1853, A61B2018/1869, A61B2018/1838, A61B2018/1823, A61B2018/00577, A61B2018/1892, Y10T29/49018, Y10T29/49005, Y10T29/49007, Y10T29/49016, A61B18/18, A61B18/1815|
|European Classification||A61B18/18M, A61B18/18|
|Dec 30, 2009||AS||Assignment|
Owner name: VIVANT MEDICAL, INC., CALIFORNIA
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|Jun 14, 2010||FPAY||Fee payment|
Year of fee payment: 4
|Apr 2, 2013||AS||Assignment|
Owner name: COVIDIEN LP, MASSACHUSETTS
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